WoW crashes when I tag a dungeon

Hi,

for some time I have a bug, in some situations I can't dungeon anymore.
It happened to me 2 times this WE, the first time was after a friend boosted me the Stockade to the dungeon limit per hour, I ran the RDF and once I tag crash. I tried several times to log in but either I had the error "a character with this name is already logged in" or once logged in and I clicked on the eye to teleport into the instance, crash.
And this time after leaving Drak'Tharon Keep because everyone was gone, I retagged the RDF while doing my quests and I tagged during a mount quest. So I jump from the vehicle, I accept the dungeon and it falls on Drak'Tharon Keep except that it crashes and impossible to join therefore obliged to leave and to have the penalty.

I have this error message, maybe someone already had this problem and was able to solve it?
https://ibb.co/C5K94gJ

frostmourne realm?

Yeah in frostmourne realm

do you have wotlk with WoD/HD models?

edit:
Basically there are x2 different things that may cause you those kind of problems:

1. you join RDF while you already have triggered the "limit" for the amount of dugeon you have already joined.
So if you try to "walk" into a new dungeon -> you get an error message which let you know that you have to wait.
But if you are unware of that and you try to join an RDF -> your client get freezed when you accept to enter (basically this old bug: https://www.warmane.com/bugtracker/report/68980 )

2. Your client with WoD models crash due to some issue caused by the "crossfaction" mechanism

I don't use the WoD models.

I think this is the first case yes